Fix binary flag test in cext. #51
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MySQL Connector 8.0.16 with cext tries to decode binary values as unicode strings because it fails to detect when a BINARY_FLAG is set on a MySQL value.
The old test
!((flags != NULL) & flags & BINARY_FLAG)
is always 1 (i.e. it assumes the field is not binary).This fix also allows MySQL connector to work seamlessly with SQLAlchemy (without any unicode/binary conversion issues).